?url_ver=Z39.88-2004&rft_id=10.1103%2FPhysRevLett.89.258702&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Guido&rft.au=Caldarelli%2C+Guido&rft.aulast=Caldarelli&rft.title=Physical+Review+Letters&rft.volume=89&rft.atitle=Scale-Free+networks+from+varying+vertex+intrinsic+fitness&rft.date=December+2002&rft.issn=0031-9007&rft.issue=25&rft.genre=article